feat(sqlite): fix impl for missing pi and e functions

ibis/backends/sqlite/registry.py

@@ -300,5 +300,7 @@ def _string_join(t, op):
         ops.BitwiseXor: fixed_arity(sa.func._ibis_sqlite_xor, 2),
         ops.BitwiseNot: unary(sa.func._ibis_sqlite_inv),
         ops.Where: fixed_arity(sa.func.iif, 3),
+        ops.Pi: fixed_arity(sa.func._ibis_sqlite_pi, 0),
+        ops.E: fixed_arity(sa.func._ibis_sqlite_e, 0),
     }
 )

ibis/backends/sqlite/udf.py

@@ -272,6 +272,16 @@ def _ibis_sqlite_inv(x):
     return None if x is None else ~x
 
 
+@udf
+def _ibis_sqlite_pi():
+    return math.pi
+
+
+@udf
+def _ibis_sqlite_e():
+    return math.e
+
+
 class _ibis_sqlite_var:
     def __init__(self, offset):
         self.mean = 0.0